Subject
- Agricultural conservation -- Oregon -- Willamette River Valley -- Economic aspects1
- Agricultural conservation -- Oregon -- Willamette River Valley -- Evaluation1
- Agricultural machinery1
- Agricultural pollution -- Oregon -- Willamette River Valley1
- Agriculture -- Economic aspects -- Mathematical models1
- Agriculture and state -- Environmental aspects -- Oregon -- Willamette River Valley1
- Juniper -- Oregon -- Ecology1
- Juniper -- Oregon -- Steens Mountain1
- Nitrogen cycle -- Oregon -- Steens Mountain1
- Public lands -- Nevada -- Fees1
- Public lands -- Oregon -- Fees1
- Ranches -- Economic aspects -- Nevada1
- Ranches -- Economic aspects -- Oregon1
- Rangelands -- Economic aspects -- Nevada1
- Rangelands -- Economic aspects -- Oregon1
- Stripe rust1
- Understory plants -- Effect of logging on -- Oregon -- Steens Mountain1
- Wheat -- Diseases and pests1
- Wheat -- Oregon1
- Wheat -- Varieties1